Question

Two different type of packets get into a single server system which capacity is 80 Mbps:
1. Type 1 – Deterministic length of 10 Bytes. Arrival rate: 50000 packets/s
2. Type 2 – Exponential length of 25 Bytes. Arrival rate of 10000 packets/s.
The quality of service (QoS) is satisfied when the service time for type 1 packets is lower than 2 µs. For this reason, priority is given to type 1 packets. Which of the following situations ensure achieving the quality of service?

A. It accomplishes the QoS condition if the packets have preemptive priority and it does
not if they have non-preemptive priority.
B. It accomplishes the QoS condition if the packets have non-preemptive priority and it
does not if they have preemptive priority.
C. It does not accomplished the QoS condition regardless the type of priority the packets
are given.
D. It does accomplished the QoS condition regardless the type of priority the packets
are given.

Answer 1

Acc to me answer should be

Option A

i.e If packets have pre-emptive property then QOS can be accomplised otherwise not .

Take an example

We have two packets

Packet 1 and packet 2

where packet 1 is having high priority as compared to packet 2

So

If packet 2 is currently in execution and suddenly on urgent demand packet 1 wants to do some important task so if we follow pre-emptive priority then only we can stop packet 2 and start processing packet 1 by giving necesssary resources to packet 1 but in other case if we are having non-preemptive then we cannot process packet 1 until packet 2 is completed so this may leads to bad QOS

So in order to maintain good Qos

1. Give priority to all the packets

2. Follow pre-emptive approach so that situations like above can be easily handled

A network capability that permits authorized high priority traffic to take over resources assigned to lower priority traffic.This leads to a good QOS mechanism .

Thank you

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